Move request package into public/shared folder (#24420)

* move request package to public/shared

* updated app-layers

* update app layer

* remove original package location

server/channels/app/plugin_api_test.go

@@ -31,7 +31,7 @@ import (
 	"github.com/mattermost/mattermost/server/public/plugin"
 	"github.com/mattermost/mattermost/server/public/plugin/utils"
 	"github.com/mattermost/mattermost/server/public/shared/i18n"
-	"github.com/mattermost/mattermost/server/v8/channels/app/request"
+	"github.com/mattermost/mattermost/server/public/shared/request"
 	"github.com/mattermost/mattermost/server/v8/channels/utils/fileutils"
 	"github.com/mattermost/mattermost/server/v8/einterfaces/mocks"
 )